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Mesoscale Discussion 977
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   MESOSCALE DISCUSSION 0977
   NWS STORM PREDICTION CENTER NORMAN OK
   0548 PM CDT THU JUN 11 2015

   AREAS AFFECTED...PORTIONS OF NRN MO...SERN NEB...SRN IA

   CONCERNING...TORNADO WATCH 285...

   VALID 112248Z - 120015Z

   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 285 CONTINUES.

   SUMMARY...THE SEVERE WEATHER THREAT CONTINUES ACROSS THE WATCH AREA.
   A LOCAL WATCH EXTENSION WILL LIKELY BE NEEDED TO THE EAST ACROSS
   PORTIONS OF NORTHERN MISSOURI AND SOUTHERN IOWA.

   DISCUSSION...REGIONAL RADAR MOSAIC AT 2245Z SHOWS SEVERAL
   CLOSELY-SPACED SVR TSTMS FROM NODAWAY CO MO SWWD TO RICHARDSON CO
   NEB...WITH ISOLATED TSTMS FARTHER W ACROSS JOHNSON/PAWNEE COUNTIES
   NEB. THE IMMEDIATE DOWNSTREAM ENVIRONMENT ACROSS NORTHWEST
   MO/EXTREME SWRN IA REMAINS SUPPORTIVE OF A CONTINUED SVR HAIL/WIND
   THREAT WITH MOD-STRONG SFC-BASED INSTABILITY AND MID-LEVEL FLOW OF
   35-40 KTS.  BACKED SFC WINDS ACROSS S-CENTRAL IA/N-CENTRAL MO HAS
   RESULTED IN EFFECTIVE SRH IN THE 200-300 M2/S2 RANGE...AND THUS THE
   TORNADO RISK WILL ALSO CONTINUE. WITH TIME...SOME UPSCALE GROWTH IS
   ANTICIPATED WITH AN INCREASING SVR WIND THREAT.

   AN AREAL EXTENSION TO WW 285 WILL LIKELY BE REQUIRED AS TSTMS MOVE
   INTO S-CENTRAL IA/N-CENTRAL MO AFT 23Z.

   ..BUNTING.. 06/11/2015


   ATTN...WFO...DMX...EAX...OAX...

   LAT...LON   40089648 40399644 40629613 40839534 40929451 40909331
               40429306 40099339 39859417 39899467 40029532 40089648 

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